Function ToLower 

pub fn ToLower(s: impl AsRef<[byte]>) -> Vec<byte> 

ToLower returns s with all Unicode letters mapped to their lower case.

zh-cn

返回将所有字母都转为对应的小写版本的拷贝。

Example

use gostd_bytes as bytes;

assert_eq!("gopher".as_bytes().to_vec(),bytes::ToLower("Gopher"));
assert_eq!("gopher".as_bytes(),bytes::ToLower("Gopher"));